The fixed reed and quite uniform diameter of the clarinet give the device an acoustical conduct approximating that of a cylindrical stopped pipe. Recorders use a tapered internal bore to overblow at the octave when the thumb/sign up hole is pinched open, while the clarinet, with its cylindrical bore, overblows at the 12th. Adjusting the attitude of the bore taper controls the frequencies of the overblown notes
harmonics. Changing the mouthpiece's tip setting up and the length of the reed adjustments features of the harmonic timbre or voice of the clarinet as a result
of this changes the speed of reed vibrations. Generally, the goal of the clarinetist when generating a legit is to make as much of the reed vibrate as possible, making the sound fuller, warmer, and probably louder. The lip function and force, shaping of the vocal tract, choice of reed and mouthpiece, amount of air pressure created, and evenness of the airflow account for most of the clarinetist's skill to handle the tone of a clarinet.